Commit Graph

9 Commits

Author SHA1 Message Date
Denys Vlasenko
470bebe672 udhcpc6: add comments about option 39, no code changes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-06-27 18:31:08 +02:00
Denys Vlasenko
234b82ca19 udhcpc6: add support for timezones
Basedon patch by Bernd Holzmüller <bernd.holzmueller@tiggerswelt.net>

function                                             old     new   delta
option_to_env                                        504     580     +76

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-06-26 19:42:48 +02:00
Denys Vlasenko
ed898ed2dd udhcp6: fix releasing
Patch is based on work by tiggerswelt.net. They say:
"
We wanted udhcpc6 to release its IPv6-Addresses on
quit (-R-commandline-option) which turned out to generate once again
kind of garbage on the network-link.
We tracked this down to two issues:

 - udhcpc6 uses a variable called "srv6_buf" to send packets to
   the dhcp6-server, but this variable is never initialized correctly
   and contained kind of a garbage-address

 - The address of the dhcp6-server is usually a link-local-address,
   that requires an interface-index when using connect() on an AF_INET6-
   socket

We added an
additional parameter for ifindex to d6_send_kernel_packet() and made
d6_recv_raw_packet() to capture the address of the dhcp6-server and
forward it to its callee.
"

Three last patches together:

function                                             old     new   delta
d6_read_interface                                      -     454    +454
d6_recv_raw_packet                                     -     283    +283
option_to_env                                        249     504    +255
.rodata                                           165226  165371    +145
send_d6_discover                                     195     237     +42
send_d6_select                                       118     159     +41
send_d6_renew                                        173     186     +13
send_d6_release                                      162     173     +11
opt_req                                                -      10     +10
d6_send_kernel_packet                                304     312      +8
opt_fqdn_req                                           -       6      +6
d6_mcast_from_client_config_ifindex                   48      51      +3
d6_find_option                                        63      61      -2
udhcpc6_main                                        2416    2411      -5
static.d6_recv_raw_packet                            266       -    -266
------------------------------------------------------------------------------
(add/remove: 5/1 grow/shrink: 8/2 up/down: 1271/-273)         Total: 998 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-03-27 22:44:22 +02:00
Denys Vlasenko
64d58aa806 udhcp6: fix problems found running against dnsmasq
Patch is based on work by tiggerswelt.net. They say:
"
But when we tried to use dnsmasq on server-side, udhcpc6 was unable to
forward the acquired address to its setup-script although the
IPv6-Address had been assigned by the server as we could see via
tcpdump. We traced this issue down to a problem on how udhcpc6 parses
DHCPv6-Options: When moving to next option, a pointer-address is
increased and a length buffer is decreased by the length of the option.
The problem is that it is done in this order:

  option += 4 + option[3];
  len_m4 -= 4 + option[3];

But this has to be switched as the length is decreased by the length of
the *next* option, not the current one. This affected both - internal
checks if a required option is present and the function to expose
options to the environment of the setup-script.
There was also a bug parsing D6_OPT_STATUS_CODE Options, that made
dnsmasq not work as udhcpc6 thought it is receiving a non-positive
status-code (because it did not parse the status-code as required in RFC
3315).
In addition we introduced basic support for RFC 3646 (OPTION_DNS_SERVERS
and OPTION_DOMAIN_LIST) and RFC 4704 (OPTION_CLIENT_FQDN).
"

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-03-27 22:41:59 +02:00
Denys Vlasenko
e09f5e3045 udhcp6: read_interface should save link-local ipv6 address
Patch is based on work by tiggerswelt.net. They say:
"Using this patch it was no problem to acquire an IPv6-Address via DHCPv6
using ISC DHCPD6 on server-side."

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-03-27 22:41:59 +02:00
Denys Vlasenko
8cab66730a fix build breakage found by randconfig
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2012-04-20 14:48:00 +02:00
Denys Vlasenko
a092a89d8f udhcpc6: rudimentary code to export data to script; fix IAADDR parsing
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2011-11-16 20:17:12 +01:00
Denys Vlasenko
68c5b28156 udhcpc6: fix endianness
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2011-11-07 16:21:24 +01:00
Denys Vlasenko
9ba75048c0 udhcpc6: new applet. Not yet functional.
It builds. It sends Solicit packets. Not sure these packets are well-formed.
I have no server to test it against.

function                                             old     new   delta
udhcpc6_main                                           -    2426   +2426
d6_send_raw_packet                                     -     428    +428
d6_send_kernel_packet                                  -     274    +274
d6_recv_raw_packet                                     -     248    +248
send_d6_discover                                       -     177    +177
packed_usage                                       28795   28966    +171
d6_run_script                                          -     156    +156
send_d6_renew                                          -     140    +140
send_d6_release                                        -     126    +126
d6_recv_kernel_packet                                  -     116    +116
send_d6_select                                         -      95     +95
perform_d6_release                                     -      78     +78
d6_find_option                                         -      74     +74
init_d6_packet                                         -      54     +54
d6_copy_option                                         -      48     +48
d6_mcast_from_client_config_ifindex                    -      42     +42
d6_dump_packet                                         -      24     +24
static.FF02__1_2                                       -      16     +16
d6_store_blob                                          -      13     +13
applet_names                                        2432    2440      +8
applet_main                                         1412    1416      +4
applet_nameofs                                       706     708      +2
add_d6_client_options                                  -       1      +1
------------------------------------------------------------------------------
(add/remove: 21/0 grow/shrink: 4/0 up/down: 4721/0)          Total: 4721 bytes
   text	   data	    bss	    dec	    hex	filename
 879080	    493	   7584	 887157	  d8975	busybox_old
 884585	    497	   7584	 892666	  d9efa	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2011-11-07 15:55:39 +01:00